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6   Solutions
6.1   Solution #1 S-GW/BBIFF based GTP tunnel extraction
6.1.1   Description
6.1.2   S-GW/BBIFF based GTP tunnel extraction architecture reference model   Word-p. 20
6.1.3   Process Flow for Architectural Approach of Solution #1
6.1.4   Call Flow for architectural approach of Solution #1   Word-p. 24
6.1.5   Solution approach to key issues   Word-p. 25
6.1.5.1   Approach to key issue #1 - IMEI targeted LI
6.1.5.2   Approach to key issue #2 - Tel-URI or SIP-URI targeted LI      Up
6.1.5.3   Approach to key issue #3 - LI targeted S8 GTP selection criteria   Word-p. 27
6.1.5.4   Approach to key issue #4 - Obtaining network provided location   Word-p. 28
6.1.5.5   Approach to key issue #5 - Intra-access handover or anchor change impact
6.1.5.6   Approach to key issue #6 - Detecting targeted signalling unknown or unrecognized by the VPLMN      Up
6.1.5.7   Approach to key issue #7 - Maintaining intra-PLMN and inter-PLMN LI undetectability
6.1.5.8   Approach to key issue #8 -Detecting implicit IMS registrations   Word-p. 30
6.1.5.9   Approach to key issue #9 - Retained Data
6.1.5.10   Approach to key Issue # 10 - Prevention of unwanted use of confidentiality mechanisms
6.1.5.11   Approach to key Issue # 11 - Non-Local Identity
6.1.5.12   Approach to key issue #12 - Non-3GPP codec or 3GPP codec in a non-3GPP mode in CC
6.1.5.13   Approach to key issue #13 - Start of interception with ongoing VoLTE call   Word-p. 31
6.1.5.14   Approach to key issue #14 - Correlation of CC with IRI
6.1.5.15   Approach to key issue #15 - Signalling Compression
6.1.6   Impacts on existing nodes and interfaces      Up
6.2   Solution #2 - Enhanced Architecture
6.3   Solution #3 - Data forwarding from HPLMN   Word-p. 40
6.4   Solution #4 Retained Data Solution supporting ETSI and VPLMN control requirements   Word-p. 43      Up

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